Speaking of Huangdi Neijing, anyone who knows a little about TCM knows that it is the most famous classic of TCM. This book is still regarded as a must-read for studying Chinese medicine. The saying "seven losses and eight benefits" has a long history. Huangdi Neijing mentioned the health theory of "seven damages and eight benefits" more than 2000 years ago, but the book did not specify the content of "seven damages and eight benefits". It was not until the precious medical bamboo slips "Tian Dao Lun" unearthed from Mawangdui tomb in Changsha that the specific content of "seven damages and eight benefits" was discovered, which is a great contribution to the theory of atrioventricular health care in China. At the same time, it also reveals the eternal unsolved case that doctors in later generations argued endlessly and failed to reach an agreement.

The "seven losses" mentioned in "On the World" refers to "one closure, two discharges, three thirst (exhaustion), four blessings (no), five annoyances, six disappointments and seven consumptions."

Explained in modern language, the seven evils mainly refer to seven practices that are harmful to the human body during sexual intercourse, namely: rude and reckless actions during sexual intercourse lead to pain in the five internal organs, which is "closure" (adduction); During sexual intercourse, sweating profusely and exhaustion of essence is called "leakage" (leakage); Excessive sexual intercourse, too much sex, qi and blood failure, called "failure"; And "happiness" means that although there is a strong sexual impulse, it cannot be carried out because of impotence; During sexual intercourse, my heart is agitated and it is "annoying"; One party has no sexual desire, and the other party has forced sexual intercourse. At this time, both sides are very unfavorable to the woman's physical and mental health, just like being in a desperate situation, so it is called "absolutely"; When sexual intercourse is too fast, it is neither pleasant nor beneficial to the body, wasting energy. This is called "fee". The ancients used very vivid language to say seven practices harmful to body and mind in atrioventricular health care. If you commit the above seven evils, it will often backfire and lead to diseases. This explanation still has important scientific significance and reference value for us today.

In view of seven practices that are harmful to human body in sexual intercourse, the ancients also put forward eight practices that are beneficial to human body in atrioventricular life, namely, "eight benefits", namely, "one is to treat qi, the other is to cause foam, the third is wisdom, the fourth is beast, the fifth is foam, the sixth is to steal qi, the seventh is to win the temple, and the eighth is to stay in the body."

Here, the specific treatment methods of Bayi are introduced one by one. Namely: 1. Regulating essence; 2. Cause body fluid; 3. Grasp the appropriate handover opportunity; 4. store essence and nourish essence; 5. Adjust vaginal fluid; 6. Accumulate the essence; 7. stay full; 8. Prevent impotence.